One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,6,9,12)(7,10,13,16)(8,11,15,18)(14,17,19,20)(21,22,26,31)(23,32,34,36)(24,29,25,30)(27,33,28,35)(5,7)(6,10)(8,14)(9,13)(11,17)(12,16)(15,19)(18,20)(21,23,25,33,26,34,24,35)(22,27,29,36,31,28,30,32)(2,4)(7,13)(10,16)(14,19)(17,20)(21,23,24,35,26,34,25,33)(22,28,30,36,31,27,29,32)(5,8)(6,11)(7,14)(9,15)(10,17)(12,18)(13,19)(16,20)(21,24,26,25)(22,29,31,30)(23,33,34,35)(27,32,28,36)(8,15)(11,18)(14,19)(17,20)(23,34)(27,28)(32,36)(33,35) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.